ACORN: Framework Overview ACORN (Alternating Curvature Ontology of Relational Nature) is a geometric framework for fundamental physics. It is founded on a small and explicit set of structural elements: spatial coordinates (x,y,z), observational time t, curvature-governed circulatory time T, two alternating curvature components (m_NE, m_eq) and the universal constants c and h. Within ACORN, physical reality is described in terms of circulating curvature. In the absence of curvature, no structure or observable phenomena arise. When curvature components circulate, intertwine, and close, relational structures emerge that correspond to matter, charge, time, and space. Observational spacetime(x, y, z, t) is treated as a projection of this deeper five-dimensional SpaceTime+ geometry, in which the circulation of curvature defines both inertial and temporal structure. Under the constraints explicitly adopted in the framework, ACORN provides geometric recoveries and reinterpretations of a wide range of established physical relations, including gravitation and electromagnetism, relativistic invariance, quantisation, and the mass–charge structure of elementary matter. These results are developed across the volumes as internally consistent derivations rather than as empirical claims of experimental closure. A central role is played by the circulation period T, which arises naturally from closed curvature dynamics and serves as an intrinsic temporal scale for matter. The necessity of T leads to a five-dimensional geometric formulation, with observable four-dimensional physics emerging through projection. Within this context, phenomena traditionally associated with quantum theory are examined as manifestations of curvature phase and projection. ACORN does not proceed by introducing new particles or force mediators. Instead, it develops physical behaviour from geometric structure and constraint. The framework was discovered and developed through extended analytical reasoning and thought experiment, and its chronological development is documented across six monograph volumes and four foundational papers. Volumes I–VI present this development inapproximate historical order, with some thematic overlap. New readers may find Volume VI a useful entry point for an overview of the complete framework. The development and presentation of ACORN have made extensive use of contemporary computational tools, including large language models, alongside traditional analytic methods. These tools are treated as aids to reasoning and exposition, not as sources of physical assumption. ACORN - Volume III This volume collects fifteen independent derivations developed during the foundational construction of the ACORN framework. Each chapter addresses a distinct physical constant, law, or phenomenon and demonstrates how it arises from a common geometric structure: a five dimensional curvature manifold with orthogonal even and odd mass channels. The derivations span fundamental constants, inertial behaviour, electromagnetism, gravitation, radiation, particle structure, quantisation, exclusion principles, annihilation processes, and cosmological dynamics. While unified in notation and assumptions, each chapter is logically self-contained and may be read independently. The purpose of this volume is not to assert experimental closure, but to establish internal consistency, structural sufficiency, and explanatory reach within the stated assumptions of the ACORN framework. Together, the results define the mathematical backbone upon which later phenomenological and interpretive developments are built.